/Engine/Source/Runtime/Engine/Classes/GameFramework/PlayerMuteList.h
Server unmuting based on gameplay rules
void GameplayUnmutePlayer ( class [APlayerController](API\Runtime\Engine\GameFramework\APlayerController) * OwningPC, const [FUniqueNetIdRepl](API\Runtime\Engine\GameFramework\FUniqueNetIdRepl) & UnmuteId )